lifts



H. C. RIDOUT.

MOLD FOR MAKING HEELS, LIFTS, SOLES, OR OTHER ARTICLES FROM RUBBER OR OTHER MATERIAL.

APPLlcAloN FILED MAR.5.1920.

1,383,857, Patented July 5, 1921.

2 SHEETS-SHEET l.

y @ai /n H. C. RIDOUT.

MOLD FOR MAKING HEELS, LIFTS, SOLES, OR OTHER ARTICLES FROM RUBBER 0R OTHER MATERIAL.

`APPLICATIONr FILED MAR.5. 1920.

1,383,857. Patented July 5, 1921.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

HARRY CHARLES RIDO'UT, OF BOURNEMOUTH, ENGLAND.

V HOLD F03 HAIING BEELS, LIFTS, SOLES, OR OTHER ARTICLES FROM RUBBER 0B OTHER MATERIAL Specification of Letters Patent.

Patented July 5, 1921.

Application led March 5, 1920. Serial No. 363,368.

To all 'wlw/m it may concern:

Be it known that I, HARRY CHARLES Rmotrr, a subject of the King of Great Britain and residing at Bournemouth, Hamps ire, England, have invented new and useful Im rovements in and Relating to Molds for aking Heels, Lifts, Soles, or other Articles from Rubber or other Material, of which the following is a specification.

This invention consists of improvements in and relatin to molds employed in the manufacture o resilient heels, lifts, soles or such other articles as are capable of being produced from resilient or non-resilient material therein.

In manufacturing resilient heels, lifts, soles or similar classes of molded articles (hereinafter for brevity referred to as products) it is usualpractlce, in view of the great numbers generally reflluired, to employ a multiple or gang mo d for this purpose, although a mold unit of the single type can also be employed.

In other types of mold it has been proposed to produce a mold having a base and top plate and in either of these plates, or part y in one and partly in the other the matrix or matrices for giving the desired form to the finished roduct are machined out from the, solid u ate or plates. It has been further proposed to construct a mold which is .composed of a base, intermediate plate and top late, or three mold members, each machinedp from solid material so as to register one ,with the other and it is in, on, and througlithese members that the actual matrix, matrices or configuration and shape giving cavity or cavities for the finished roduct are milled, profiled, machined or liand formed; this cannot be accomplished unless extreme accuracy with considerable skill is exercised, more especially so in the case where a multiple or gang mold of this pattern Vhas to be produced.

f Whenforming the actual matrices in a multiple or gang mold it is necessary (if the obtaining of a uniform product therefrom is desired) that said matrices are each absolute duplicates of one another; and where they4 are afterward emplo ed to -serve in any 'processof vulcanization 1t is further necessary that a uniform density and porosity of the material from which they are constructed should be obtained. The foregolng conditions are extremely rare or most diflicult of attainment when matrices are formed by machining them out of the solid or by forming them during casting of the material from which they are made, due to the normal variation both as regards density and porosity found to exist in articles so roduced, and it is with a view of overcoming these defects and constructing molds with correctly formed and uniformly dense matrices that the present invention has been devised.

One of the objects of this invention is to provide a type of mold member containing or having a matrix or matrices or a part or parts thereof, therein or thereon, produced y the process of die-stamping pressing, or similar die-forming methods, from sheet or other metal or material, so as to insure and enable the accurate and easy duplication of the configuration or shape of the matrix or matrices part or parts thereof, and in which when it becomes necessary to produce quantities of such mold members the construction is such as to allow and enable said mold member to be vemployed as a single mold unit, enable said single mold units, which are suitably formed for the purpose, to be readily mounted in holders or containerplates in various multiple or gang forms of placement, or alternatively, the mold member containing numbers of duplicate matrices is constructed' with a multiple of matrices in the first instance, and from these matrices the heels, lifts, soles or such artic'les as may be made from rubber or other material hereinbefore and hereinafter referred to are intended to form the products.

A further object of this invention is to rovide a means of construction adapted partlcularly for use in a multiple or gang mold in which a part of a single matrix or the parts of a comparatively few matrices usually employed as a working-gang are contained in one specially formed demountable, easily renewable, attachable and duplicate mold member unit, for allowing, in the event of injury to any one matrix or the matrices contained in said mold member unit. the easy replacement of such unit, (of which several form a gang) as without such possibility of renewal the whole gang would become practically useless from a producing and output standpoint.

A further object of this invention is to provide a moldvdesigned so as to produce a resilient liftnforthe heels orsoles of boots and-shoes, whichlift will be a product, .having the marginal edges of its upper faces in a single plane and the upper faces of tiers formed therein parallel thereto and in such a manner as to provide a convexa-nd n concave shape on both its upper and under faces. or a corrugated or waved yform on any linefofSi cross-sectiony designed to be fixed 4flat on the heel or sole ofa boot or shoe-and formedin its upper concavesurface with a number of tiers or steps and .a convex .or domed-partbothor eitherhaving small concavities serving as auxiliary suction cups or areas therein which divide the upper surfaceinto v*a number of independent concave areas, and lfor the sake ofconvenience the invention ,will be described, illustrated and referred to more particularlyas,employed to 3producejsuch va .resilientlift as is used on the heels'of boots and shoes of thekind andformv previously referred to.

@ther incidental objects of the invention willappear as ythe description of the same proceeds.

The'invention will now be described with referencefto the accompanying drawings, yin whichz- V.Figure 1 is a plan view of the k'top member of a single type .of mold unit in which' one part ofthe matrix is provided, accordingto this invention.

Fig. 2 is a plan view of thebottom memberof asing'le type of mold unit lin which the other [part of the .matrix is provided, accordingto this invention.

Fig. 3-is a sectional view taken on the line AeA, Fig; f1.

. Fig. 4 `is a sectionalview taken on the line AB-fB, Fig. 2.

Fig. 5 is a plan view ofthe member shown in Fig.,1, as fitted ina portion ofa mold container-plate according to this invention.

Fig. 6 is a plan view of the member shown in Fig. 2, as fitted in a portion of almold container-plate "according to this invention.

Fifr. 7 is a sectional view taken on .the'line o d of rig. 5.

Fig. 8 is a sectional view taken on the line D-D of, Fig. 6.

Fig. 9 yis a plan View showing a portion of a bottom mold container plate in whichv a number of the bottom members of the` l. single type of mold shown in Fig. 2, are inserted and arranged in a multiple or gang form ofy placement, according to this invention.

Fig. 10 shows a sectional view taken on the vline E-E of Fig. 9, above which in sectional view also is shown in their assembled ters of reference referto'likeparts.throughout the drawings.

Briefly the invention consists in .the method of constructionfor producing as die- Stampings or pressings from sheet or other metal or material, the configuration and shape giving faces, cavity or matrix form in divisible-mold members employedinjthe manufacture of articles-'from rubber or Yother plastic materials, and vfurther during .the construction of said mold members, 'flanges are formed, in or on which registeringevices and surplus vgrooves or channels are provided; said anges contain the means for holdlng the mold units together, they. are

further employed for attaching the mold o members when fitted on or into specially formed perforated sinoleaor multiple mold container AYplates whic are provided for reinforcing as well as holding 'the Vmold members either singly or in a gang f ormof placement.

In-carrying out byinvention, lI employ i a Vcomplete self contained and selfV registerl ing divisible mold unit ycomposed of two chiefparts, one being the top part (ai) and the other being the `bottom part l'(ctl), said complete mold unit is constructed tlo'venable it to be used independently of, or in conjunction with, two specially formedsandperforated mold container lates, 1one being the top container plate and the'other'ibeing the bottom contalner plate These Plates (M) and "(N) are Pmidedto enable' the chief parts (a) and (a') ofthe mold units to be correctly mounted in a multiple or gang form of placement, as Qshownjin Figs. 9' and 10, which method of.mountingy allows a large number of products, `to be made at one operation.

vThe top part (a) of the rdivisible mold unit is produced by a process ,giving absolute interchangeability with others fof its kind and is provided in its under surface with a recess or cavity of any desired ,conf tour, depth, or size which forms partc of the matrix, and when vit is employed for making resilient heels o fl the'vliind Vl'1erein-V- above referred to it isrprovided en the dosed end of its recess with a convexity `('b') adjacent to the walls of said said con- ,vexityy (b) encircles a series of steps or tiers (c) on which, for some types, domed projectlonsA (c) are rovided to produce concavities in tbe rro uct. The inner row of steps or tiers` vel encircle a flat rtion (d) parallel to t e planes of the aces of the tiers (c) whicharealso parallel to the mar j' al edge of the recess or cavity, and insi e or encircled by said flat portion (d) is provided a concavity (d2) to produce a convex centrally located domed part in the upper surface of the roduct and on the face of said concavity d2) domed projections (d) are provided to produce auxiliar?I concavities in the part of the product ormed by (d2). The marginal edge of the matrix recess or cavity of the top mold unit (a) is provided with a marginal knife 0r edge trimmer (h) which is employed for trimming and cutting away any surplus material during the molding of the product and where the interchangeable complete single mold units are em eyed, the surplus so removed is accommo ated partly in a channel (f) surroundin the knife h) provided in the flange (i) o the top mo d unit (a) and partl in a correspondmg channel provid in the flange (i) of the bottom mold unit a).

Ho es (k) are provided in the flange (i) of the top part a) of the divisible-mold unit, to accomm registering pegs l; provided on and secured in the flange z' of the bottom part (a) of the divlsib emold unit; which holes (k) and pegs (l) cause both the top and bottom matrix part of said mold units to register or aline correctly when one is superimposed in relation to the other.

Screws m are dprovided for securing the top art (a) an the bottom part a) of the divisible mold units in either t e top container-plate (M) or the bottom container-plate (N) in which container-plate (M) said to art a) and in which coniainr-plate sai bottom part (a) are tte The bottom part (a) of the divisiblemold unit is also produced by a process 'ving absolute interchangeability wlth ot ers of its kind, and is provided in its upper surface with a recess or cavity of any desired contour, depth, or size which forms the other part of the matrix, and when it is employed for making resilient heels of the kind hereinbefore referred to it is provided on the closed end of its recess with a concavity or concave channel (e and adjacent to the mar inal edge of sai recess or cavity and centra ly placed or located therein is provided a convex part g), employed to produce a centrally placed concavity in the under face of the product.

From the closed end of the recess or cavity of the matrix formed in the bottom part (a) of the divisible-mold unit, I provide Washer locating pe s having coniorm heads, which pegs j) rise perpendicularly therefrom in relation to the plane of the flange and grouped around or from one peg (j) 1n the center or shallow part of the recess or cavity and preferabl located in its deepest point as shown in ligs. 2, 4, 6, 8, 9 and 10, are other washer locating pegs or alternatively one perpendicular washer locating` peg (j) rises centrally placed in the recess as shown in Fig. l2.

Both the to container-plate (M) for the mold unit (a) and the bottom containerplate (N) for the mold unit (af) are provided With perforations (o) for accommodating the said top and bottom mold members; said container plates (M) and (N) are also provided with a step or stepped part (p) for receivin the flanges (i) of' the mold units (a) and (ed), they are also provided with ribs (q) for insurmg parallelism of the edges and true registering of the mold units (a) and (a) both during and after their assembly therein, in either a sin le, multiple, or ang form of placement.

igs. 9 and 10 il ustrate clearly perforations from which a single divisible-mold unit has been removed.

In the modification shown in Figs. 11 and 12, which illustrates a multi-matrix type of mold in which several duplicates of the matrix part are contained in the top and bottom mold members, it is possible to dispense with the top and bottom mold containerplates (M) and (N), and when this is done the matrix carrying top and bottom mold units (a) and (a) are formed and provided with projections (n) thereon for taking the pressure durin the molding of the product and for regu ating the degree of closeness between the top and bottom mold units (a) and (al) when they are in their su erimposed and assembled positions.

n the practice of this invention the top mold unit (a) is superimposed in relation to the bottom unit (a3 as mdicated in Figs. 10 and 12, and in pro ucing rubber or other resilient heels by my improved method, before said top and bottom units (a) and (a) are brought into close proximity one with the other, rubber, composition, or other material from which the product is made is placed in one or both of the cavities form- 1ng the matrix proper in a suflicient quantity to completely fill the said cavities or recesses. The mold units (a) and (a) are afterward brought together by means of a h draulic press or other machine so that the p astic mass in the matrix part of the mold unit will be compressed and solidified and any surplus thereby extruded will be accommodated in the channel or channels (f) as indicated in Figs.'1 to 10, or on the face of the plate (i) inthe modification indicated in Figs. 11 and'l2.

-When material Lfor thev product is capable of vulcanizationthe moldunits'are heated to such anvextent as to correctly viilcanize the mass so that it `W1l=be rendered very tough and durable, but at the Sametime will retain its resiliency.

The lwasher locating pegs i (j) With'coniform heads Ilocate special dished Washers which rest upon'the coniform part and re# main embedded in the product in the process of manufacture.

As previously stated, for the sake of convenience the invention is described, illus# trated and referred to more particularly as employed in 'the production of a resilient lift as is used on the heels'of boots and shoes of the kind herein referred to, but it will be obvious that'the method'fofconstruction of the mold units comprising` a complete divisible mold as shown in the illustrations may be employed in fthe manufacture of products of other kinds, sizes and shapes fromrubber or other material Without departing from the spirit 'of the inventionf 'What-"I claim i'st-V l Y A divisible mold" for forming resilient heels or the; like, said mold comprising sepa.- 'rable members having ecessesformed there- 'inproducedby stampin from two v'separate l Vex-and concave parts,'a pertures yforrn'edfil'l one offsaid flanges and vp egs'en the other flange adapted 'to registerwith said apertures whereby said members are properly positioned. i'

VDated)thistentl'lday'of February 1920; 1j 'HARRY'CHA'RLES 'amour Witnesses: i -Y f FRANK HUMPHRIS, 1' IElmer Lamm. f 

